Structural beam



FIG. 1 is a front view of a structural beam;

FIG. 2 is a first end view of the structural beam of FIG. 1;

FIG. 3 is a back view of the structural beam of FIG. 1;

FIG. 4 is a first side view of the structural beam of FIG. 1;

FIG. 5 is a second end view of the structural beam of FIG. 1;

FIG. 6 is a second side view of the structural beam of FIG. 1;

FIG. 7 is a first perspective view of the structural beam of FIG. 1; and,

FIG. 8 is a second perspective view of the structural beam of FIG. 1.

The claimed design has been broken near one end to indicate indeterminate length. 

The ornamental design for a structural beam, as shown and described. 